Lorenz SZ-40/42 "TUNNY"
The Lorenz cipher machine was developed by Lorenz and used in WWII by the German Army High Command. Hilter used it to communicate with his generals. This cipher machine was dubbed "TUNNY" by British codebreakers at Bletchly Park. In August 1941, Bill Tutte led them to intercept two in-depth messages and key stream. By January of 1942, they had figured out how TUNNY worked and built a replica.
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Lorenz, “Lorenz "TUNNY",” Ciphers and Encryption, accessed May 19, 2022, https://crypto.omeka.net/items/show/12.